Method, device, and computer storage medium for radio connection

ABSTRACT

A method, device and a computer storage medium for wireless connection are provided. The method includes that: a main Transmission Point (TP) sends a connection indication to User Equipment (UE), the connection indication being used to indicate the UE to establish a connection with at least one sub TP on the premise of keeping a current connection with the main TP.

CROSS REFERENCE TO RELATED APPLICATIONS

This patent document is a continuation of and claims priority to U.S.patent application Ser. No. 15/029,912, filed on Apr. 15, 2016, which isa national stage application under 35 U.S.C. 371 of International PatentApplication No. PCT/CN2014/077695, filed on May 16, 2014, which claimsthe benefit of priority of Chinese Patent Application No.201310486110.9, filed on Oct. 16, 2013. The entire contents of thebefore-mentioned patent applications are incorporated by reference aspart of the disclosure of this application.

TECHNICAL FIELD

The disclosure relates to a mobile wireless communication technology,and in particular to a method, device and a computer storage medium forwireless connection.

BACKGROUND

In a wireless cellular communication system, an Evolved Node B (eNB) orBase Station (BS) is a device providing wireless access for UserEquipment (UE) which may also be called a terminal, and the eNB or BSperforms wireless communication with the UE through an electromagneticwave. One eNB or BS may provide one or more serving cells, and awireless communication system may provide wireless coverage forterminals within a certain geographical range through the serving cells.

In order to provide wireless communication for users in a large range, awireless communication system is required to deploy an eNB or BS with alarge coverage area, such an eNB or BS is usually called a macro eNB ormacro BS, and its serving cell is usually called a macro cell. Inaddition, in consideration of different requirements of users anddifferent application environments, the wireless communication system isrequired to provide users with wireless communication service forcompensating coverage holes or provide users with wireless communicationservice having higher quality, so that some small eNBs or BSs withnarrow coverage ranges and lower transmitted power are adopted. Thesesmall eNBs or BSs include pico eNBs or pico BSs and femto eNBs or femtoBSs, wherein the femto eNBs or femto BSs may also be called Home NBs(HNBs) or Home eNBs (HeNBs), cells provided by the pico eNBs or pico BSsare called pico cells, and cells provided by the femto eNBs or femto BSsare called femto cells. Nodes corresponding to small eNBs or BSs arealso called Low Power Nodes (LPNs), and cells corresponding to theseLPNs are also called small cells. The macro eNBs or BSs, the small eNBsor BSs, the pico eNBs or BSs and the femto eNBs or femto BSs may also becollectively referred to as Transmission Points (TPs).

When an ideal backhaul link connection is adopted between a macro eNB orBS and a pico eNB or BS, or between a pico eNB or BS and a pico eNB orBS or between a macro eNB or BS and a macro eNB or BS, rapid handoverbetween the eNBs or BSs may be implemented. For example, when anideal-backhaul link connection is adopted between a macro eNB or BS anda pico eNB or BS, the pico eNB or BS may be considered as a “virtualdistributed antenna” of the macro eNB or BS, UE accessing the pico eNBor BS may also be considered to access the macro eNB or BS, and it mayalso be considered that the UE may be rapidly handed over between themacro eNB or BS and pico eNB or BS which adopt the ideal-backhaul linkconnection.

However, under some circumstances, for example, under limits of anenvironmental factor or a cost factor, only a non-ideal backhaul linkconnection may be adopted between eNBs (or BSs), and. When UE is handedover between the eNBs (or BSs) adopting the non-ideal backhaul linkconnection, data transmission between the eNBs may be delayed, whichdisables the UE to rapidly switch between the eNBs and influences theperformance of the UE. Particularly for a scenario with more smallcells, the probability of handover between eNBs or BSs adopting anon-ideal backhaul link connection is higher, and the performance of UEis influenced more by incapability of rapid handover.

SUMMARY

The embodiments of the disclosure provide a method, device and acomputer storage medium for wireless connection, which may implementrapid handover of UE between eNBs or BSs adopting a non-ideal backhaullink.

The technical solutions of the embodiments of the disclosure areimplemented as follows.

An embodiment of the disclosure provides a method for wirelessconnection, which may include that:

a main TP sends a connection indication to UE, the connection indicationbeing used to indicate the UE to establish a connection with at leastone sub TP on the premise of keeping a current connection with the mainTP.

An embodiment of the disclosure provides a method for wirelessconnection, which may include that:

UE receives a connection indication sent by a main TP; and

a connection is established with at least one sub TP according to theconnection indication on the premise of keeping a connection with themain TP.

An embodiment of the disclosure provides a method for wirelessconnection, which may include that:

a sub TP identifies UE which accesses the sub TP according to accessinformation of the UE, wherein the UE may include single-connection UEand/or multi-connection UE.

An embodiment of the disclosure provides a method for wirelessconnection, which may include that:

a centralized control node performs multi-connection control on a mainTP and a sub TP.

An embodiment of the disclosure provides a TP, which may include:

a sending unit, configured to send a connection indication to UE, theconnection indication being used to indicate the UE to establish aconnection with at least one sub TP on the premise of keeping a currentconnection with the main TP.

An embodiment of the disclosure provides UE, which may include:

a receiving unit, configured to receive a connection indication sent bya main TP; and

a connection unit, configured to establish a connection with at leastone sub TP according to the connection indication on the premise ofkeeping a current connection with the main TP.

An embodiment of the disclosure provides a TP, which may include:

a storage unit, configured to store access information of UE whichaccesses the TP; and

an identification unit, configured to identify the UE according to theaccess information of the UE, wherein the UE may includesingle-connection UE and/or multi-connection UE.

An embodiment of the disclosure provides a node, which may include acontrol unit, configured to perform multi-connection control on a mainTP and a sub TP.

An embodiment of the disclosure provides a computer storage medium, inwhich a computer-executable instruction may be stored, thecomputer-executable instruction being configured to execute any one ofthe above-mentioned method for wireless connections.

From the above, the technical solutions of the embodiments of thedisclosure include that: a main TP sends a connection indication to UE,the connection indication being used to indicate the UE to establish aconnection with at least one sub TP on the premise of keeping a currentconnection with the main TP. The UE receives the connection indicationsent by the main TP; and the UE establishes the connection with the atleast one sub TP according to the connection indication on the premiseof keeping the current connection with the main TP. Therefore, the UEsimultaneously accesses multiple TPs adopting non-ideal backhaul links,and then the UE can be rapidly switched between eNBs or BSs adopting thenon-ideal backhaul links according to the disclosure. In addition,network communication performance may also be improved in the embodimentof the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a first implementation flowchart of a method for wirelessconnection according to an embodiment of the disclosure;

FIG. 2 is a second implementation flowchart of a method for wirelessconnection according to an embodiment of the disclosure;

FIG. 3 is a third implementation flowchart of a method for wirelessconnection according to an embodiment of the disclosure;

FIG. 4 is a fourth implementation flowchart of a method for wirelessconnection according to an embodiment of the disclosure;

FIG. 5 is a structure diagram of a TP according to an embodiment of thedisclosure;

FIG. 6 is a structure diagram of UE according to an embodiment of thedisclosure; and

FIG. 7 is a structure diagram of a TP according to an embodiment of thedisclosure.

DETAILED DESCRIPTION

The disclosure will be further described below with reference to thedrawings and specific embodiments in detail.

An embodiment of the disclosure provides a method for wirelessconnection, which includes that:

a main TP sends a connection indication to UE, the connection indicationbeing used to indicate the UE to establish a connection with at leastone sub TP on the premise of keeping a current connection with the mainTP.

Here, the main TP includes: 1) a node corresponding to a primary servingcell; and 2) any connected TP which may be selected as the main TP;

the sub TP includes: 1) a TP in a cell service list of the main TP, 2) aTP selected from TPs to which a centralized control node belongs; and 3)a TP autonomously detected by the UE;

the TPs may be considered as eNBs or BSs, or may be considered asserving cells, and for example: a main TP corresponds to a primaryserving cell, a sub TP corresponds to a secondary serving cell, and thesub TP is a TP or a serving cell capable of being independentlyscheduled and independently receiving a feedback from UE, and isdifferent from a secondary serving cell in a carrier aggregationscenario; or, the main TP corresponds to a macro eNB or BS (macro cell),and the sub TP corresponds to a pico eNB or BS (small cell) and thelike;

in addition, the multiple connections may be connections for specificservices (service), different services correspond to different TPs, anddifferent services correspond to different connections; or, the multipleconnections may be connections which do not distinguish services.

Preferably, the method further includes that:

the main TP acquires related information of at least one sub TP, andsends related information of a selected sub TP in the acquired relatedinformation of the at least one sub TP to the UE.

Here, the related information of the selected sub TP may be contained inone piece of information for transmission to the UE together with theconnection indication, or may also be independently transmitted to theUE.

Preferably, the method further includes that:

the main TP acquires basic information of the at least one sub TPthrough the UE, and selects a sub TP according to predefinedinformation, the predefined information including the basic information;or,

the main TP acquires the related information of the at least one sub TP,and selects a sub TP from the at least one sub TP according topredefined information, wherein the predefined information includes therelated information of the at least one sub TP.

Here, the first predefined information may simultaneously include thebasic information of the at least one sub TP and the related informationof the at least one sub TP; and the second predefined information maysimultaneously include the basic information of the at least one sub TPand the related information of the at least one sub TP.

Preferably, the step that the main TP acquires the related informationof the at least one sub TP includes that:

the main TP interacts with the at least one sub TP to obtain the relatedinformation of the at least one sub TP; or,

the main TP obtains the related information of the at least one sub TPthrough the centralized control node.

Preferably, the method further includes that: the main TP receives a subTP disconnection request from the UE.

Preferably, the method further includes that: the main TP executes oneof the following operations of:

sending a sub TP reselection indication to the UE; sending sub TPreselection assistance information to the UE; sending a main TPreselection indication to the UE; and sending a sub TP disconnectionindication to the UE or sending a confirmation of the sub TPdisconnection request to the UE, wherein

the sub TP reselection indication is configured to indicate the UE toreselect a sub TP; the sub TP reselection assistance information isconfigured to assist the UE in sub TP reselection; the main TPreselection indication is configured to indicate the UE to reselect themain TP; the sub TP disconnection indication is configured to indicatethe UE to be disconnected from a target sub TP; and the confirmation ofthe sub TP disconnection request is a confirmation which is returned bythe TP after receiving the sub TP disconnection request.

Here, reselection may also be considered as handover, i.e. handover fromone TP to another TP, or handover from one serving cell to anotherserving cell.

FIG. 1 is an implementation flowchart of a method for wirelessconnection according to an embodiment of the disclosure, and as shown inFIG. 1, the method includes the following steps.

Step 101: a main TP sends a connection indication to UE, the connectionindication being configured to indicate the UE to establish a connectionwith a sub TP selected by the main TP on the premise of keeping acurrent connection with the main TP.

Here, one sub TP may be selected, or multiple sub TPs may also beselected.

In a practical application, when multiple sub TPs are selected, the UEmay also select one sub TP from the selected sub TPs for connection.

Step 102: the main TP acquires related information of at least one subTP and/or basic information of the at least one sub TP.

Preferably, the step that the main TP acquires the related informationof the at least one sub TP includes that:

the main TP interacts with the at least one sub TP to obtain the relatedinformation of the at least one sub TP respectively; or,

the main TP obtains the related information of the at least one sub TPthrough a centralized control node.

Preferably, the step that the main TP acquires the basic information ofthe at least one sub TP includes that: the main TP acquires the basicinformation of the at least one sub TP through the UE.

Here, the centralized control node is a control node at a higher levelcompared with the main TP and the sub TP or a Mobility Management Entity(MME); and when the main TP acquires the basic information of the atleast one sub TP through the UE, the main TP may perform sub TPselection according to the basic information obtained by downlinkmeasurement of the UE, thereby ensuring downlink transmission from theat least one sub TP to the UE.

Here, when the main TP interacts with the at least one sub TP to obtainthe related information of the at least one sub TP respectively, or whenthe main TP obtains the related information of the at least one sub TPthrough the centralized control node, the main TP may perform sub TPselection according to measurement of an uplink signal of the UE, wherethe measurement is performed by the at least one sub TP, and estimate adownlink channel by virtue of an uplink channel, or, the main TP maydirectly select a sub TP according to a path loss value. In this way,the UE is not required to measure a sub TP measurement or send afeedback, thereby reducing the complexity of the UE, and guaranteeinguplink transmission from the UE to the at least one sub TP.

Here, information exchanged between the main TP and the at least one subTP includes at least one of: system configuration information of the atleast one sub TP; uplink timing offset measured by the at least one subTP according to the uplink signal of the UE; and uplink path loss,uplink power values, frequency information, cell Identifiers (IDs) anduser-specific configuration information measured by the at least one subTP according to the uplink signal of the UE.

Here, the information obtained by interaction between the main TP andthe at least one sub TP or the related information obtained by the mainTP through the centralized control node specifically includes at leastone of: frequency information; cell IDs; a system message; user-specificconfiguration information; uplink timing regulation; the number ofconnected UE; and whether multiple connections are adopted or not.Therefore, the UE may directly perform blind detection on downlinkcontrol information and perform data interaction with the at least onesub TP after downlink synchronization is implemented between the UE andthe at least one sub TP. The UE thus may rapidly establish a connectionwith another TP for data interaction according to the relatedinformation, thereby accelerating a system message acquisition processand an uplink synchronization process of the new TP.

Here, the UE may autonomously select a sub TP and accesses the selectedsub TP at a frequency point according to frequency information. The UEaccesses a new sub TP. In such a manner, a multi-connectionestablishment flow may be simplified, and the times of interactionbetween the main TP and the at least one sub TP may be reduced. In apractical application, the UE may also select a sub TP corresponding toa cell ID and accesses the selected sub TP at the frequency pointaccording to the frequency information and the cell ID. In such amanner, complexity caused by autonomous selection of the UE over the atleast one sub TP may be reduced, and centralized management isfacilitated.

Here, the system message includes at least one of: Physical RandomAccess Channel (PRACH) configuration information of the TP; a downlinksystem bandwidth; an uplink frequency point; an uplink system bandwidth;a duplex system; information about proportion between uplink anddownlink; Multicast Broadcast Single Frequency Network (MBSFN) subframeconfiguration information; information about a sending indication ofother system information block(s); information about subframeconfiguration for uplink Sounding Reference Signal (SRS) transmission;and Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH)configuration information.

Here, the user-specific configuration information includes at least oneof: Physical configuration information about resource starting positionof Uplink Control Channel (PUCCH); uplink power control parameterinformation; and Enhanced Downlink Control Channel (ePDCCH) relatedconfiguration information.

Step 103: the main TP selects a sub TP according to the acquired relatedinformation and/or basic information of the at least one sub TP.

Step 104: the main TP sends the related information of the selected subTP to the UE.

Preferably, the method further includes that:

the main TP sends a sub TP reselection indication or a main TPreselection indication to the UE, wherein the sub TP reselectionindication is configured to indicate the UE to reselect a sub TP; andthe main TP reselection indication is configured to indicate the UE toreselect the main TP.

Here, reselection may also be considered as handover, i.e. handover fromone TP to another TP, or handover from one serving cell to anotherserving cell.

An embodiment of the disclosure further provides a method for wirelessconnection, and as shown in FIG. 2, the method includes the followingsteps:

Step 201: UE receives a connection indication sent by a main TP; and

Step 202: the UE establishes a connection with at least one sub TPaccording to the connection indication on the premise of keeping acurrent connection with the main TP.

Here, the sub TP establishing the connection with the UE may reallocatea user-specific physical layer ID, i.e. a Cell Radio Network TemporaryIdentifier (C-RNTI), to the UE; or, the UE may report a C-RNTI of the UEin the main TP in a process of uplink synchronization with the sub TP;or, the UE may report its pre-allocated C-RNTI in the sub TP in theprocess of uplink synchronization with the sub TP.

A TP of a higher level manages UE which simultaneously accesses the mainTP and the sub TP; or, the sub TP confirms a multi-connection identityof the UE according to a Media Access Control (MAC) address of the UE;or, the sub TP confirms the multi-connection identity of the UEaccording to a proprietary resource (a cell ID corresponding to the mainTP, a unique identification code of the UE, identification informationallocated by a centralized control node, or multi-connectionidentification signalling) of the UE.

Preferably, the method further includes that:

the UE receives, from the main TP, related information of a sub TP, andestablishes a connection with the sub TP according to the relatedinformation of the sub TP.

Preferably, the method further includes that: the UE measures the sub TPto acquire basic information of the sub TP, and reports the basicinformation to the main TP.

Here, one or more, for example, 3 or 6, sub TPs may be reported.

The basic information, measured by the UE, of the sub TP may include:the cell ID, and Reference Signal Receiving Power (RSRP) correspondingto the TP.

For example, the UE may detect at least one of the following signals:each synchronization channel corresponding to each sub TP, eachCell-specific Reference Signal (CRS) corresponding to each sub TP, andeach cell Discovery Signal (DS) corresponding to each sub TP; and thesesignals are measured to obtain the basic information, for example: cellIDs and RSRP, corresponding to the at least one sub TP. Thecorresponding sub TP(s) is (are) selected and reported.

Preferably, the sub TP connected with the UE or the sub TP measured bythe UE includes at least one of:

a sub TP designated by the centralized control node;

a sub TP designated by the main TP; and

a sub TP autonomously selected by the UE.

Preferably, the method further includes that:

the UE receives a sub TP reselection indication sent by the main TP;

sub TP reselection is performed in at least one of the following mannersthat:

the UE keeps the connection with the main TP, quits a connection with acurrent sub TP, and selects a new sub TP for connection;

the UE keeps the connection with the main TP, and directly performs subTP handover at the current sub TP; and

the UE keeps the connection with the main TP, and switches from thecurrent sub TP to another sub TP under assistance of the main TP.

Here, sub TP reselection performed in the manner of directly performingsub TP handover at the current sub TP is similar to inter-cell handoverunder a single-connection condition in a related technology, which doesnot require assistance of the main TP or require a sub TP quittingprocess.

Sub TP reselection performed in the manner of implementing handover fromthe current sub TP to another sub TP under assistance of the main TPalso does not require a process of quitting from the sub TP.

Preferably, the method further includes that:

the UE receives a main TP reselection indication sent by the main TP;

main TP reselection is performed in at least one of the followingmanners that:

the UE quits the connection with the current sub TP, and performs mainTP handover; the UE keeps the connection with the current sub TP, andperforms main TP handover; the UE keeps the connection with the currentsub TP, and the sub TP assists the UE in main TP handover; and the mainTP and the sub TP are simultaneously handed over to a pair of new mainTP and sub TP.

In a practical application, the UE may also autonomously send the sub TPreselection indication or the main TP reselection indication to the subTP or the main TP, and execute sub TP reselection operation afterconfirmation of the sub TP or the main TP.

Preferably, when the UE is disconnected from a target sub TP, at leastone of the following manners may be adopted:

the UE receives a sub TP disconnection indication from the main TP, andis then disconnected from the target sub TP; the UE receives a sub TPdisconnection indication from the sub TP, and then is disconnected fromthe target sub TP; the UE sends a sub TP disconnection request to themain TP or the sub TP, and then is disconnected from the target sub TPafter a confirmation is made by the main TP or the sub TP; and the UEsends a sub TP disconnection request to the main TP or the sub TP, andthen is disconnected from the target sub TP.

An embodiment of the disclosure further provides a method for wirelessconnection, and as shown in FIG. 3, the method includes the followingstep:

Step 301: a sub TP identifies UE which accesses the sub TP according toaccess information of the UE, wherein the UE includes single-connectionUE and/or multi-connection UE.

Preferably, the access information of the UE includes at least one of:

a C-RNTI of the UE used in a main TP; a cell ID corresponding to themain TP; a unique identification code (such as an International MobileSubscriber Identity (IMSI) and an International Mobile EquipmentIdentity (IMEI)) of the UE, identification information allocated by acentralized control node, and a proprietary resource of the UE;multi-connection identification signalling of the UE; and a C-RNTI ofthe UE used in the sub TP.

Here, the proprietary resource includes a specific uplinksynchronization channel resource, and the specific uplinksynchronization channel resource includes: a specific time-frequencyresource and/or a specific sequence.

Here, the access information may be obtained in a process during whichthe UE accesses the sub TP access, or may also be obtained after the UEaccesses the sub TP.

Preferably, the method further includes that:

the sub TP transmits own related information to the main TP, and/oracquires the access information, transmitted by the main TP, of themulti-connection UE.

Preferably, the method further includes that:

the sub TP assists the accessing multi-connection UE in implementingmain TP handover.

Preferably, the method further includes that: the sub TP executes one ofthe following operations:

the sub TP sends a sub TP disconnection indication to the accessingmulti-connection UE, the sub TP disconnection indication being used toindicate the UE to be disconnected from a designated sub TP;

the sub TP receives a sub TP disconnection request from themulti-connection UE, and returns a confirmation; and

the sub TP receives a sub TP disconnection request from themulti-connection UE.

An embodiment of the disclosure further provides a method for wirelessconnection, and as shown in FIG. 4, the method includes the followingstep:

Step 401: a centralized control node performs multi-connection controlon a main TP and a sub TP.

Preferably, the multi-connection control is: control over at least oneof:

selection of a main TP; selection of a sub TP; selection ofmulti-connection UE; identification of multi-connection UE accessing thesub TP; sub TP handover for the multi-connection UE; and sub TPdisconnection from the multi-connection UE.

Preferably, the multi-connection control includes: control overtransmission of at least one of the following information:

information about selection of a main TP; information about selection ofa sub TP; related information of the sub TP; information about selectionof multi-connection UE; identification information of themulti-connection UE accessing the sub TP; information about sub TPhandover for the multi-connection UE; and information about sub TPdisconnection from the multi-connection UE.

An embodiment of the disclosure further provides a computer storagemedium, in which a computer-executable instruction is stored, thecomputer-executable instruction being configured to execute the methodof managing wireless connection as shown in any one of FIG. 1 to FIG. 4.

An embodiment of the disclosure further provides a TP, and as shown inFIG. 5, the TP includes:

a sending unit 501, configured to send a connection indication to UE,the connection indication being used to indicate the UE to establish aconnection with at least one sub TP on the premise of keeping a currentconnection with the main TP.

Here, there are one selected sub TP or a plurality of TPs.

Preferably, the TP further includes: an acquisition unit 502, configuredto acquire related information of at least one sub TP; and

correspondingly, the sending unit 501 is further configured to sendrelated information of a selected sub TP in the acquired relatedinformation of the at least one sub TP to the UE.

Preferably, the TP further includes a selection unit 503, configured toacquire basic information of the at least one sub TP through the UE, andselects the sub TP according to predefined information, the predefinedinformation including the basic information; or,

select the sub TP according to predefined information, wherein thepredefined information includes the related information, acquired by theacquisition unit, of the at least one sub TP.

Preferably, the acquisition unit 502 is configured to interact with theat least one sub TP to obtain the related information of the at leastone sub TP; or, obtain the related information of the at least one subTP through a centralized control node.

Preferably, the TP further includes a receiving unit 504, configured toreceive a sub TP disconnection request sent by the UE.

Preferably, the sending unit 501 is further configured to execute one ofthe following operations of: sending a sub TP reselection indication tothe UE; sending sub TP reselection assistance information to the UE;sending a main TP reselection indication to the UE; sending a sub TPdisconnection indication to the UE; and sending a confirmation of thesub TP disconnection request to the UE, wherein

the sub TP reselection indication is configured to indicate the UE toreselect a sub TP; the sub TP reselection assistance information isconfigured to assist the UE in reselecting a sub TP; the main TPreselection indication is configured to indicate the UE to reselect themain TP; the sub TP disconnection indication is configured to indicatethe UE to be disconnected from a target sub TP; and the confirmation ofthe sub TP disconnection request is a confirmation which is returned bythe TP after receiving the sub TP disconnection request.

In a practical application, each unit in the TP may be implemented by aCentral Processing Unit (CPU), a Digital Signal Processor (DSP) or aField-Programmable Gate Array (FPGA) in the TP.

An embodiment of the disclosure provides UE, and as shown in FIG. 6, theUE includes:

a receiving unit 601, configured to receive a connection indication sentby a main TP; and

a connection unit 602, configured to establish a connection with atleast one sub TP according to the connection indication on the premiseof keeping a current connection with the main TP.

Preferably, the receiving unit 601 is further configured to receive,from the main TP, related information of the at least one sub TP; and

the connection unit 602 is configured to establish the connection withthe at least one sub TP according to the related information of the atleast one sub TP.

Preferably, the UE further includes: a measurement unit 603, configuredto measure the at least one sub TP to acquire basic information of theat least one sub TP, and report the basic information to the main TP.

Here, one or more, for example, 3 or 6, sub TPs may be reported.

The related information may include: a cell ID, and a RSRP valuecorresponding to the TP.

Preferably, the sub TP connected with the UE or the sub TP measured bythe UE includes at least one of:

a sub TP designated by a centralized control node;

a sub TP designated by the main TP; and

a sub TP autonomously selected by the UE.

Preferably, the receiving unit 601 is further configured to receive asub TP reselection indication from the main TP;

the UE further includes a sub TP reselection unit 604, configured toperform sub TP reselection in at least one of the following manners of:

keeping the connection with the main TP, quitting a connection with acurrent sub TP, and selecting a new sub TP for connection;

keeping the connection with the main TP, and directly performinghandover from the current sub TP to another sub TP; and

keeping the connection with the main TP, and implementing handover fromthe current sub TP to another sub TP under assistance of the main TP.

Preferably, the receiving unit 601 is further configured to receive amain TP reselection indication sent by the main TP;

the UE further includes a main TP reselection unit 605, configured toperform main TP reselection in at least one of the following manners of:

quitting the connection with the current sub TP, and reselecting a mainTP; keeping the connection with the current sub TP, and reselecting amain TP; keeping the connection with the current sub TP, and reselectinga main TP under assistance of the sub TP; and simultaneously switchingfrom the main TP and the sub TP to a pair of new main TP and sub TP.

Preferably, the UE further includes a triggering unit 606, adisconnection unit 607 and a sending unit 608, wherein the triggeringunit 606 is configured to trigger the receiving unit 601 to receive subTP disconnection indication information sent by from the main TP andreceive sub TP disconnection indication information from the sub TP, andtrigger the disconnection unit 607 to disconnect from a target sub TPaccording to the indication information received by the receiving unit;

the triggering unit 606 is further configured to trigger the sendingunit 608 to send a sub TP disconnection request to the main TP or thesub TP, and trigger the disconnection unit 607 to disconnect the targetsub TP after the receiving unit 601 receives a confirmation from themain TP or the sub TP; and

the triggering unit 606 is further configured to trigger the sendingunit 608 to send the sub TP disconnection request to the main TP or thesub TP, and trigger the disconnection unit 607 to directly disconnectthe target sub TP.

In a practical application, each unit in the UE may be implemented by aCPU, a DSP or a FPGA in the UE.

An embodiment of the disclosure further provides a TP, and as shown inFIG. 7, the TP includes:

a storage unit 701, configured to store access information of UE; and

an identification unit 702, configured to identify the UE according tothe access information of the UE, wherein the UE includessingle-connection UE and/or multi-connection UE.

Preferably, the access information of the UE includes at least one of:

a C-RNTI of the UE used in a main TP; an ID of a cell corresponding tothe main TP; a unique identification code (such as an IMSI and an IMEDof the UE; identification information allocated by a centralized controlnode; a proprietary resource of the UE; multi-connection identificationsignalling of the UE; and a C-RNTI of the UE used in the sub TP.

Here, the proprietary resource includes a specific uplinksynchronization channel resource, and the specific uplinksynchronization channel resource includes: a specific time-frequencyresource and/or a specific sequence.

Here, the access information may be obtained in process during which theUE accesses the sub TP, or may also be obtained after the UE accessesthe sub TP.

Preferably, the TP further includes: an information processing unit 703,configured to transmit own related information to the main TP, and/oracquire the access information of the multi-connection UE from the mainTP.

Preferably, the TP further includes: an assistance unit 704, configuredto assist the multi-connection UE in implementing main TP handover.

Preferably, the information processing unit 703 is further configured toexecute one of the following operations of: sending sub TP disconnectionindication information to the accessing multi-connection UE, the sub TPdisconnection indication information being configured to indicate the UEto be disconnected from a designated sub TP; receiving a sub TPdisconnection request of the multi-connection UE, and returning aconfirmation; and receiving the sub TP disconnection request of themulti-connection UE.

In a practical application, each unit in the TP may be implemented by aCPU, a DSP or a FPGA in the TP.

An embodiment of the disclosure further provides a node, which includesa control unit 801, configured to perform multi-connection control on amain TP and a sub TP.

Preferably, the control unit 801 is further configured to control atleast one of:

main TP selection; sub TP selection; multi-connection UE selection;identification of multi-connection UE accessing the sub TP; sub TPhandover for the multi-connection UE; and sub TP disconnection from themulti-connection UE.

Preferably, the control unit 801 is further configured to controltransmission of at least one of the following information:

information about main TP selection; information about sub TP selection;related information of the sub TP; information about multi-connection UEselection; identification information of the multi-connection UEaccessing the sub TP; information about sub TP handover for themulti-connection UE; and information about sub TP disconnection from themulti-connection UE.

In a practical application, the control unit 801 in the node may beimplemented by a CPU, a DSP or a FPGA in the node.

The main TP includes: 1) a node corresponding to a primary serving cell;and 2) any connected TP which may be selected as the main TP;

the sub TP includes: 1) a TP in a cell service list of the main TP, 2) aTP selected from TPs of a centralized control node, and 3) a TPautonomously detected by the UE;

the TPs may be considered as eNBs or BSs, or may be considered asserving cells, and for example: a main TP corresponds to a primaryserving cell, a sub TP corresponds to a secondary serving cell, and thesub TP is a TP or a serving cell capable of being independentlyscheduled and independently receiving a feedback from the UE, and isdifferent from a secondary serving cell in a carrier aggregationscenario; or, the main TP corresponds to a macro eNB or BS (macro cell),and the sub TP corresponds to a pico eNB or BS (small cell) and thelike;

in addition, multiple connections may also be connections for specificservices (service), different services correspond to different TPs, anddifferent services correspond to different connections; or, multipleconnections may also be connections which do not distinguish services.

From the above, the UE simultaneously accesses multiple TPs adoptingnon-ideal backhaul links, and then rapid handover of the UE amongeNBs(BSs) adopting the non-ideal backhaul links may be implementedaccording to the disclosure.

The disclosure will be described below with reference to specificembodiments.

Specific Embodiment 1

A main TP sends indication information to indicate UE to establishanother connection on the premise of keeping a current connection.

In the embodiment, the UE feeds back basic information of at least onesub TP, and the main TP selects a sub TP.

The UE performs measurement after obtaining the indication information,and reports the information of the sub TP with which a connection is tobe established. Or, the UE starts measuring the at least one sub TPaccording to configuration information of the main TP, and reports ameasurement result to the main TP, and the main TP sends the indicationinformation to the UE after selecting the sub TP,

wherein the at least one sub TP measured by the UE may be designated bya centralized control node, or designated by the main TP, orautonomously selected by the UE.

The reported information of the TP includes: a cell ID, an RSRP valuecorresponding to the TP, a Reference Signal Received Quality (RSRQ)value corresponding to the TP, and the like.

For example, the UE may measure one of the following informationcorresponding to each sub TP: a synchronization channel, a CRS and a DS;the UE may obtain the cell ID(s) and RSRP value(s) corresponding to theat least one sub TP according to the measurement result(s), and selectand report the best sub TP.

One or multiple TPs may be reported, for example: 3 or 6.

The main TP receives the basic information, reported by the UE, of theat least one sub TP, and the main TP selects a sub TP and sends theinformation of the sub TP to the UE.

The main TP may select the sub TP from the at least one sub TP reportedby the UE or may also select another better sub TP by integratingvarious conditions, for example: the number of UE that accesses each subTP and a distribution condition of each sub TP.

The embodiment has beneficial effects that the main TP may select a subTP according to downlink measurement of the UE, thereby ensuringdownlink transmission from the sub TP to the UE and also improvingselectivity of the UE.

Specific Embodiment 2

A main TP sends indication information to indicate UE to establishanother connection on the premise of keeping a current connection.

In the embodiment, the main TP selects a sub TP, and the UE is notrequired to feed back information of the sub TP before establishing aconnection with the sub TP.

The main TP interacts with the sub TP first to obtain relatedinformation of the sub TP; or, the main TP may also obtain the relatedinformation of the sub TP through a centralized control node.

Here, information exchanged during the interaction includes at least oneof: system configuration information of the sub TP; uplink timing offsetmeasured by the sub TP according to an uplink signal of the UE; anuplink path loss or uplink power value measured by the sub TP accordingto the uplink signal of the UE; frequency information; a cell ID;user-specific configuration information; the number of connected UE; andwhether access of multi-connection UE is allowed or not.

The TP may also send, besides the indication information, the followinginformation: related information of a TP corresponding to anotherconnection, wherein the related information may include at least one of:frequency information; a cell ID; a system message; user-specificconfiguration information; and uplink timing regulation.

The another connection may correspond to one TP or multiple TPs (a setof TPs, the UE autonomously select a specific TP for access), forexample: 3 or 6.

The system message includes at least one of: PRACH configurationinformation of the TP; a downlink system bandwidth; an uplink frequencypoint; an uplink system bandwidth; a duplex system; information aboutproportion between uplink and downlink; information about MBSFN subframeconfiguration; information about a sending indication of other systeminformation block; and information about subframe configuration for SRStransmission;

the user-specific configuration information includes at least one of:configuration information of a starting position of a PUCCH resource;uplink power control parameter information; ePDCCH related configurationinformation; C-RNT information of the UE used in the sub TP; and PRACHresource information of the UE used in the sub TP, the PRACH resourceinformation including a time-frequency position and sequenceinformation.

The embodiment has beneficial effects that the UE is not required tomeasure or feed back a sub TP, so that complexity of the UE is reduced;the main TP may select a sub TP according to measurement performed bythe sub TP for the uplink signal of the UE, for example: estimate adownlink channel by an uplink channel, or directly select a sub TPaccording to a path loss value, so that uplink transmission from the UEto the sub TP can be guaranteed; or, the sub TP is directly selectedaccording to a factor such as the distribution condition of the sub TP,the number of the UE accessing the sub TP and the like.

Specific Embodiment 3

A main TP sends indication information to indicate UE to establishanother connection on the premise of keeping a current connection; andthe main TP further sends, besides the indication information,information including: related information of a sub TP corresponding toanother connection, the related information including frequencyinformation, a cell ID corresponding to the sub TP, and systemconfiguration information.

At this moment, the UE autonomously selects a sub TP for access on afrequency point according to information of the frequency point.

A process during which the UE accesses the sub TP includes that: adownlink synchronization signal is searched at the frequency point ofthe sub TP, the sub TP with a best signal is selected forsynchronization, the system configuration information of the sub TP isacquired, and uplink synchronization is initiated to implement uplinksynchronization of the UE and the sub TP.

In an uplink synchronization process of the UE and the sub TP, the subTP may reallocate a C-RNTI to the UE.

A TP of a higher level (such as: a centralized control node and an MME)manages UE which simultaneously accesses the main TP and the sub TP, or,the sub TP confirms a multi-connection identity of the UE according toobtained information of multi-connection UE and a unique ID of the UE.

The embodiment has the beneficial effects that a multi-connectionestablishment flow is simplified, and interaction between the main TPand the sub TP is reduced.

Specific Embodiment 4

A main TP sends indication information to indicate UE to establishanother connection on the premise of keeping a current connection; andthe main TP further sends, besides the indication information,information including: related information of a sub TP corresponding toanother connection, the related information includes information of afrequency point and information of a cell ID, and the UE selects the subTP corresponding to the cell ID at the frequency point for accessaccording to the information of the frequency point and the informationof the cell ID.

An access process of the UE to the sub TP includes that: a downlinksynchronization signal corresponding to the sub TP is searched at afrequency point of the sub TP (a cell ID corresponds to a specific subTP and a cell ID corresponds to a specific downlink synchronizationchannel) for synchronization, system configuration information of thesub TP is acquired, and uplink synchronization is initiated to implementuplink synchronization of the UE and the sub TP.

The UE may report a C-RNTI of the UE used in the main TP in a processthat the UE performs uplink synchronization with the sub TP, and stilluses a user-specific physical layer ID of the main TP in the sub TP; or,in the process of uplink synchronization of the UE and the sub TP, thesub TP may reallocate a C-RNTI to the UE, and the UE may not report itsC-RNTI used in the main TP when the UE performs uplink synchronizationwith the sub TP.

A TP of a higher level (such as: a centralized control node and an MME)manages UE which simultaneously accesses the main TP and the sub TP, or,the sub TP confirms a multi-connection identity of the UE according toobtained information of multi-connection UE and a unique ID of themulti-connection UE, or, the sub TP confirms its multi-connectionidentity according to the user-specific physical layer ID reported bythe UE and used in the main TP.

The embodiment has the beneficial effects that complexity caused byautonomous selection of the UE over the sub TP is reduced, andcentralized management is facilitated.

Specific Embodiment 5

A main TP sends indication information to indicate UE to establishanother connection on the premise of keeping a current connection; andthe main TP further sends, besides the indication information,information including: related information of a sub TP corresponding toanother connection, the related information including at least one of:information of a frequency point and information of a cell ID; systemconfiguration information; user-specific configuration information; anduplink timing information, wherein the user-specific configurationinformation includes at least one of: configuration information of aPUCCH resource which bears uplink control information corresponding to asub TP; power control information of an uplink control channel and/or anuplink data channel; sequence configuration information of an uplinkreference signal; sequence configuration information of a downlinkreference signal; configuration information of an ePDCCH; andinformation about a C-RNTI allocated to the UE by the sub TP.

The UE may directly perform blind detection on downlink controlinformation sent by the sub TP after downlink synchronization with thesub TP, and perform uplink and downlink data interaction with the sub TPaccording to the downlink control information; or,

the UE may perform uplink synchronization according to uplinksynchronization channel resource information in the user-specificconfiguration information after the UE realizes downlink synchronizationwith the sub TP, and in a process of uplink synchronization of the UEand the sub TP, the sub TP may reallocate a C-RNTI to the UE, and thesub TP identifies the UE to confirm its multi-connection UE identityaccording to an uplink synchronization channel resource;

or, the UE may perform uplink synchronization after downlinksynchronization with the sub TP, and report information about the C-RNTIallocated by the sub TP in the process of uplink synchronization of theUE and the sub TP, and the sub TP confirms that the UE ismulti-connection UE according to the reported C-RNTI information; or,

the UE may perform uplink synchronization after realizing downlinksynchronization with the sub TP, and report a cell ID corresponding tothe main TP (a unique identification code of the UE, identificationinformation allocated by the centralized control node andmulti-connection identification signalling) in the process of uplinksynchronization of the UE and the sub TP, and the sub TP confirms thatthe UE is multi-connection UE according to the information reported bythe UE.

In the embodiment, the UE may rapidly establish the connection withanother sub TP for data interaction according to related information, sothat a system message acquisition process and an uplink synchronizationprocess for the new TP are reduced, or, the sub TP may identify themulti-connection UE more easily.

Specific Embodiment 6

A process of quitting multi-connection includes at least one offollowing operations:

a main TP indicates UE to be disconnected from a sub TP, for example:the main TP sends an indication to the UE, the indication being used toindicate the UE to be disconnected from the sub TP, and when there aremultiple sub TPs connected with the UE, the indication further includesIDs of the disconnected sub TPs;

the UE may feed back whether the indication is successfully received ornot to the main TP after receiving the indication, and does not receivedata of the sub TP any longer after a defined time interval, and then isdisconnected from the sub TP; and

the UE does not send a feedback to the main TP after receiving theindication, and does not receive the data of the sub TP any longer afterthe defined time interval, and then is disconnected from the sub TP.

The sub TP indicates the UE to be disconnected from the sub TP, forexample: the sub TP sends an indication to the UE, the indication beingused to indicate the UE to be disconnected from the sub TP; the UE mayfeed back whether the indication is successfully received or not to thesub TP after receiving the indication, and does not receive data of thesub TP any longer after a defined time interval, and then isdisconnected from the sub T; and the UE may also not send a feedback tothe sub TP after receiving the indication, does not receive the data ofthe sub TP directly after the defined time interval, and is disconnectedfrom the sub TP.

The UE autonomously sends a disconnection request to the sub TP or themain TP, and is disconnected from the sub TP after confirmation of theTP.

Specific Embodiment 7

A sub TP reselection process in a multi-connection state includes atleast one of the following operation that:

a connection with a sub TP is released, and then a connection with a newsub TP is established;

a connection with a main TP is kept, and sub TP handover is directlyperformed on the current sub TP; such a manner is similar to inter-cellhandover under a single-connection condition in the related technology,assistance from the main TP is not required, and a process of quittingfrom a sub TP is not required; and

a connection with the main TP is kept, handover from the current sub TPto another sub TP is implemented under assistance of the main TP, andsuch a manner does not require a process of quitting from the sub TP.

Specific Embodiment 8

A main TP reselection (cell handover) process in a multi-connectionstate includes at least one of the following operation that:

connections with all sub TPs are released, and then single-pointhandover is performed;

a main TP is independently handed over, and connections with sub TPs arekept;

the connections of the sub TPs are kept, and the sub TPs assist the UEin implementing handover of the main TP; and

a main TP and a sub TP are simultaneously handed over to a pair of newmain TP and sub TP.

Specific Embodiment 9

A centralized control node controls a main TP and a sub TP.

The control includes at least one of: main TP selection; sub TPselection; multi-connection UE selection; identification ofmulti-connection UE accessing a sub TP; sub TP handover for themulti-connection UE; and sub TP disconnection from the multi-connectionUE.

The control further includes transmission of at least one of thefollowing information:

information about main TP selection; information about sub TP selection;related information of the sub TP; information about multi-connection UEselection; identification information of the multi-connection UEaccessing the sub TP; information about sub TP handover for themulti-connection UE; and information about sub TP disconnection from themulti-connection UE.

The main TP and/or the sub TP establish(es) multi-connection with UEaccording to information transmitted by the centralized control node.

According to the embodiment, the technical solution provided by theembodiment of the disclosure implements connections between the UE andmultiple TPs, and solves the problem that handover among the TPs (eNBsor BSs, terminals, cells and TPs) adopting non-ideal backhaul linkscannot be performed rapidly. In addition, the disclosure may alsoimprove network communication performance.

In the embodiments provided by the disclosure, it should be understoodthat the system, device and method may be implemented in other manners.For example, the device embodiment described above are only schematic,for example, the modules or units are divided logically. In practice,other division manners may also be adopted, for example, multiple unitsor components may be combined or integrated into another system, or somecharacteristics may be ignored, or may be not executed. From anotherpoint, coupling or direct coupling or communication connection, asdisplayed or discussed, may be implemented through interfaces; indirectcoupling or communication connection between devices or between unitsmay be electrical, mechanical or the like.

The units described as separate components may be or may be notphysically separated, and components displayed as units may be or may benot physical units, namely, the components may be located in the sameplace, or may also be distributed to multiple network units. A part orall of units may be selected to implement the solutions of theembodiments according to a practical requirement.

In addition, each function unit in each embodiment of the disclosure maybe integrated into one processing unit, or may also exist independentlyand physically, or two or more than two units may also be integratedinto one unit. The integrated units may be implemented by hardware, ormay also be implemented by software function units.

The integrated units, when implemented in form of software function unitand sold or used as independent products, may be stored in acomputer-readable storage medium. Based on such understanding, thetechnical solutions of the disclosure substantially or the parts makingcontributions to a conventional art or all or part of the technicalsolutions may be embodied in form of software product, and the computersoftware product is stored in a storage medium, including a plurality ofinstructions configured to enable a computer device (which may be apersonal computer, server, network device or the like) or a processor toexecute all or part of steps of the method of each embodiment of thedisclosure. The storage medium includes: various media capable ofstoring program codes such as a U disk, a mobile hard disk, a Read-OnlyMemory (ROM), a Random Access Memory (RAM), a magnetic disk, or acompact disc.

The above are only the specific implementation modes of the disclosureand not intended to limit the scope of protection of the disclosure. Anyvariations or replacements apparent to those skilled in the art withinthe technical scope of the disclosure shall fall within the scope ofprotection of the disclosure. Therefore, the scope of protection of thedisclosure shall be subjected to the scope of protection of the claims.

What is claimed is:
 1. A method for wireless communication, comprising:sending, by a main Transmission Point (TP), a connection indication toUser Equipment (UE), the connection indication being used to indicatethe UE to establish a connection with at least one sub TP on the premiseof keeping a current connection with the main TP; acquiring, by the mainTP, related information of the at least one sub TP; and acquiring, bythe main TP, basic information of the at least one sub TP through theUE, and sending related information of the at least one sub TP to theUE; wherein the related information is sent to the UE together with theconnection indication.
 2. The method according to claim 1, wherein theacquiring, by the main TP, the related information of the at least onesub TP comprises: performing, by the main TP, an interaction with the atleast one sub TP to obtain the related information of the at least onesub TP.
 3. The method according to claim 1, further comprising:receiving, by the main TP, a sub TP disconnection request from the UE.4. The method according to claim 1, wherein the basic informationincludes a downlink measurement of the UE.
 5. A method for wirelesscommunication, comprising: receiving, by User Equipment (UE), aconnection indication from a main Transmission Point (TP); measuring atleast one sub TP to acquire basic information of the at least one subTP, and reporting the basic information to the main TP; receivingrelated information of the at least one sub TP from the main TP; andestablishing a connection with the at least one sub TP according to therelated information of the at least one sub TP and the connectionindication; wherein the related information is received by the UEtogether with the connection indication.
 6. The method according toclaim 5, wherein the at least one sub TP connected with the UE or the atleast one sub TP measured by the UE to comprise at least one of: a subTP designated by the main TP; or a sub TP autonomously selected by theUE.
 7. The method according to claim 5, further comprising: executing,by the UE, the following operation: sending a sub TP disconnectionrequest to the main TP or the sub TP.
 8. A Main Transmission Point,called main TP, comprising: a sending unit configured to send aconnection indication to a User Equipment, called UE, the connectionindication being used to indicate to the UE to establish a connectionwith at least one sub TP on the premise of keeping a current connectionwith the main TP; an acquisition unit configured to acquire relatedinformation of at least one sub TP; and a selection unit configured toacquire basic information of the at least one sub TP through the UE,wherein the sending unit is further configured to send the relatedinformation of the sub TP to the UE together with the connectionindication.
 9. The main TP according to claim 8, wherein the basicinformation includes downlink measurement of the UE.
 10. The main TPaccording to claim 8, wherein the acquisition unit is further configuredto: interact with the at least one sub TP to obtain the relatedinformation of the at least one sub TP.
 11. The main TP according toclaim 8, further comprising: a receiving unit configured to receive asub TP disconnection request from the UE.
 12. A User Equipment, calledUE, for wireless connection, characterized in that the UE comprises: areceiving unit configured to receive a connection indication sent by amain TP; a connection unit configured to establish a connection with atleast one sub TP according to the connection indication on the premiseof keeping a current connection with the main TP; and a measurement unitconfigured to measure the at least one sub TP to acquire basicinformation of the at least one sub TP, and report the basic informationto the main TP, wherein the receiving unit is further configured toreceive, from the main TP, related information of the at least one subTP, wherein the connection unit is further configured to establish theconnection with the at least one sub TP according to the relatedinformation of the at least one sub TP, and wherein the relatedinformation is received by the receiving unit together with theconnection indication.
 13. The UE according to claim 12, wherein thebasic information includes downlink measurement of the UE.
 14. The UEaccording to claim 12, the sub TP connected with the UE or the sub TPmeasured by the UE includes at least one of: a sub TP designated by themain TP; and a sub TP autonomously selected by the UE.
 15. The UEaccording to claim 12, further includes: a triggering unit; and asending unit, wherein the triggering unit is configured to trigger thesending unit to send a sub TP disconnection request to the main TP orthe sub TP.